Update examples/iota_lens/README.rst

Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja>
ECP-WarpX · Jan 18, 2025 · 07a102e · 07a102e
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diff --git a/examples/iota_lens/README.rst b/examples/iota_lens/README.rst
@@ -111,7 +111,7 @@ We run the following script to analyze correctness:
 .. _examples-iotalens-sdep-aperture:
 
 A nonlinear focusing channel based on the physical IOTA nonlinear magnet with aperture
-=======================================================================================
+======================================================================================
 
 A representation of the physical IOTA nonlinear magnetic element with realistic
 s-dependence, obtained using a sequence of nonlinear lenses and drifts equivalent